#!/bin/bash
s1_generate_a_series_of_files(){
	for i in {1..100}; do
		echo $i > /tmp/new_file$i
	done
}
s2_list_4_files_in_long_format_about_account_and_group(){
	ls -l /etc/{passwd,shadow,group,gshadow} | sort -d
}
s3_find_items_related_to_given_username(){
	grep -h  "^$1:" /etc/{passwd,shadow} | sort -d
}
s4_find_items_related_to_given_group_name(){
	grep -h "^$1:" /etc/{group,gshadow} | sort -d
}
s5_create_group_for_given_group_names(){
	groupadd rnd && groupadd itoperation
}
s6_create_users_and_set_their_group_as_required(){
	useradd -G rnd adam && useradd -G rnd bob && useradd -G itoperation calvin && useradd -G itoperation david && useradd -G rnd edward
}
s7_change_users_shell() {
    usermod -s /usr/bin/zsh adam
    usermod -s /usr/bin/zsh edward
}
s8_set_password_change_policy() {
    passwd -n 10 -x 60 -w 10 adam
    passwd -n 10 -x 60 -w 10 bob
    passwd -n 10 -x 60 -w 10 calvin
    passwd -n 10 -x 60 -w 10 david
    passwd -n 10 -x 60 -w 10 edward   
}
s9_set_password_for_five_users() {
	usernames=(adam bob calvin david edward)
	for i in {1..5}; do 
		echo "{usernames[((i-1))]}:password$i" | chpasswd
	done
}
s10_lock_bobs_password() {
    usermod -L bob
}
s11_include_adam_into_wheel_group() {
    usermod -a -G wheel adam
}
s12_change_files_permission() {
    for i in {1..33}; do
            chmod -R 640 /tmp/new_file$[3*i]; done
}
